EP1097791A2 - Method for controlling the assembly cycle of a frame assembling machine and machine for carrying out the method - Google Patents

Method for controlling the assembly cycle of a frame assembling machine and machine for carrying out the method Download PDF

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Publication number
EP1097791A2
EP1097791A2 EP00123439A EP00123439A EP1097791A2 EP 1097791 A2 EP1097791 A2 EP 1097791A2 EP 00123439 A EP00123439 A EP 00123439A EP 00123439 A EP00123439 A EP 00123439A EP 1097791 A2 EP1097791 A2 EP 1097791A2
Authority
EP
European Patent Office
Prior art keywords
stapling
strips
cross
section
machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00123439A
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German (de)
French (fr)
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EP1097791A3 (en
EP1097791B1 (en
Inventor
Giuseppe Raffoni
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Individual
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Individual
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Publication of EP1097791A2 publication Critical patent/EP1097791A2/en
Publication of EP1097791A3 publication Critical patent/EP1097791A3/en
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Publication of EP1097791B1 publication Critical patent/EP1097791B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B27F7/02—Nailing machines
    • B27F7/025—Nailing machines for inserting joint-nails
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B27F7/006—Nailing or stapling machines provided with means for operating on discrete points

Definitions

  • the present invention relates to a method for controlling the assembly cycle of a frame assembling machine and to a machine for carrying out the method.
  • Frame assembling machines are known in which the manufacturing cycle is controlled by a system in which the necessary information is entered by an operator by means of an appropriately provided keyboard. This information varies according to the profile of the strips that compose the frame.
  • the information that the operator must enter in the system relate to the height and number of staples to be used for the corner jointing of the strips, to the positions in which the staples are to be inserted, particularly the distance from the outside and inside comers of the frame, and to the position of the means by way of which the frames are fixed to the worktable.
  • the aim of the present invention is to provide a method which allows to automatically control an assembling machine on the basis of parameters derived from the cross-section of the strips.
  • an object of the present invention is to provide an apparatus whose characteristics are defined in the appended claims.
  • the apparatus for performing the method comprises a footing 1 provided with a worktable 2 on which means are provided for arranging strips 3 for forming a frame.
  • the footing 1 under the worktable 2, there are fixed guides 4 for the sliding of a carriage 5 which can be positioned along the guides 4 by means of a reversible motor 6 which is fixed to the footing 1 and whose output shaft 7 is threaded so as to engage by screwing in a shoulder 8 of the carriage 5.
  • the shaft 7, turned by the motor 6, allows to move the carriage 5 in both directions A and B.
  • a conventional stapling head is rigidly arranged on the carriage 5.
  • the head 9 comprises a cylinder 10 which has a vertical axis and inside which a piston 12 is movable, said piston having a stem 13 which protrudes upward and ends with a striker punch 14 for expelling the stapling elements, particularly for the corner jointing of two strips that compose the frame.
  • the striker punch 14 is guided in a channel of a head 15 which protrudes from the worktable 2 through a slot which is parallel to the shaft 7.
  • the elements for joining the strips are contained in a magazine 16 and are conveyed into the channel of the head 15 through a lateral opening of the head.
  • a fluid-actuated actuator 17 is further installed below the worktable 2 and is composed of a cylinder 18 which is fixed below the worktable 2 and in which a piston 19 runs in the direction C.
  • a column-shaped stem 20 is rigidly coupled to the piston 19, protrudes above the worktable 2 and supports a strip locking device, generally designated by the reference numeral 21, which is composed of an arm 22 which cantilevers out from the top of the column 20 to which it is fixed and includes guiding means for a pair of sliders 23 and 24.
  • Two hydraulic jacks 25 and 26 are fitted on the sliders 23 and 24 and their stems 27 and 28 protrude downward below the arm 22 and support respective pads 29 and 30 at their lower end.
  • Respective threaded shafts 31 and 32 are engaged by screwing in the sliders 23 and 24 and can be actuated by a pair of motors 33 and 34 so as to allow the movement of the sliders 23 and 24 along the guides independently of each other.
  • the motors 33 and 34 are actuated so as to place the pads 29 and 30 in the intended positions for locking the strips 3.
  • the motor 6 is actuated so as to arrange the stapling head 9 on the points where the staples for joining the strips 3 are to be inserted.
  • the method starts by reading, step 35, the cross-section of the strips that compose the frame. This can occur by means of a scanner which faces a reference "slice" of the strip used.
  • the image obtained by the scanner is processed so as to provide the stapling machine with the necessary operating instructions.
  • This processing comprises the digitizing 36 of the image in binary format (black and white).
  • the elimination 37 of the background noise from the image and the calculation and graphical visualization 38 on an appropriate display of the contour of the cross-section are performed.
  • Such calculation and visualization can use electronic filters based on differentiation processes (gradient) and linear interpolation functions.
  • the calculation 39 of the dimensions of the frame is performed and the type of strip is identified. From the detected dimensions and the type (profile) of the identified strip, identification 40 of the points where the locking pads 29 and 30 are to be placed is performed.
  • the position 41 in which the staples must be driven into the strips and their number is determined depending on the type of stapling provided, i.e., on the characteristics of the staples used, on the sectional dimensions of the strips and on the frame to be provided, and on the engagement positions of the locking pads.
  • the stapling program thus set is sent to the stapling machine 42, which performs it by initially placing the pads 29 and 30 and actuating them into the position for locking the strips and by then moving the carriage 5 along the guides 4 so that the stapling head 9 is arranged in a staple insertion point. Then, by means of the motor 6, the head 9 is moved at the other positions for inserting the staples.
  • Figure 3 illustrates an embodiment in which, after calculation 39 of the dimensions of the frame and identification of the type of strip used, a search is conducted on a database 45 which contains programs for stapling a strip having the same characteristics as the visualized one. If the search leads to a positive decision 46, the program is loaded 47 and visualized 44.
  • the program 51 is saved as new and transferred 52 to the stapling machine.
  • Figure 4 illustrates another embodiment in which, if an operator does not wish to make changes 50 to the stapling program before it is saved and sent to the stapling machine, the newness or existence of applied modifications 53 is checked.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Dovetailed Work, And Nailing Machines And Stapling Machines For Wood (AREA)
  • Automatic Assembly (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

A method for controlling the assembly cycle of strips for forming frames in assembling machines, comprising the steps of: reading, by means of a scanner, the cross-section of one of the strips that compose the frame in order to obtain a resulting image of the cross-section; digitizing the resulting image in binary format; graphically visualizing the cross-section; calculating dimensions of the cross-section; identifying points suitable for positioning the strip locking means; determining points of application of the stapling elements and the number of the elements to be applied in each point; activating the assembling machine to perform the stapling of the strips.

Description

The present invention relates to a method for controlling the assembly cycle of a frame assembling machine and to a machine for carrying out the method.
Frame assembling machines are known in which the manufacturing cycle is controlled by a system in which the necessary information is entered by an operator by means of an appropriately provided keyboard. This information varies according to the profile of the strips that compose the frame.
The information that the operator must enter in the system relate to the height and number of staples to be used for the corner jointing of the strips, to the positions in which the staples are to be inserted, particularly the distance from the outside and inside comers of the frame, and to the position of the means by way of which the frames are fixed to the worktable.
The aim of the present invention is to provide a method which allows to automatically control an assembling machine on the basis of parameters derived from the cross-section of the strips.
Within the scope of this aim, an object of the present invention is to provide an apparatus whose characteristics are defined in the appended claims.
This aim and this object are achieved with a method for controlling the assembly cycle of strips for forming frames in assembling machines, characterized in that it comprises the steps of:
  • reading, by means of a scanner, the cross-section of one of the strips that compose the frame in order to obtain a resulting image of said cross-section;
  • digitizing the resulting image in binary format;
  • graphically visualizing said cross-section;
  • calculating dimensions of the cross-section;
  • identifying points suitable for positioning strip locking means;
  • determining points of application of stapling elements and the number of said elements to be applied in each point;
  • activating the assembling machine to perform the stapling of the strips.
Further characteristics and advantages of the method according to the present invention will become better apparent hereinafter on the basis of the accompanying drawings, wherein:
  • Figure 1 is a schematic and non-limitative exemplifying view of a frame assembling machine which allows to carry out the method according to the present invention;
  • Figure 2 is a flowchart of the operating sequence of the method;
  • Figures 3 and 4 are two flowcharts of two further embodiments of the method.
    • With reference to Figure 1, the apparatus for performing the method comprises a footing 1 provided with a worktable 2 on which means are provided for arranging strips 3 for forming a frame. In the footing 1, under the worktable 2, there are fixed guides 4 for the sliding of a carriage 5 which can be positioned along the guides 4 by means of a reversible motor 6 which is fixed to the footing 1 and whose output shaft 7 is threaded so as to engage by screwing in a shoulder 8 of the carriage 5. The shaft 7, turned by the motor 6, allows to move the carriage 5 in both directions A and B.
    A conventional stapling head, generally designated by the reference numeral 9, is rigidly arranged on the carriage 5. The head 9 comprises a cylinder 10 which has a vertical axis and inside which a piston 12 is movable, said piston having a stem 13 which protrudes upward and ends with a striker punch 14 for expelling the stapling elements, particularly for the corner jointing of two strips that compose the frame.
    The striker punch 14 is guided in a channel of a head 15 which protrudes from the worktable 2 through a slot which is parallel to the shaft 7.
    The elements for joining the strips, typically laminar staples, are contained in a magazine 16 and are conveyed into the channel of the head 15 through a lateral opening of the head.
    A fluid-actuated actuator 17 is further installed below the worktable 2 and is composed of a cylinder 18 which is fixed below the worktable 2 and in which a piston 19 runs in the direction C. A column-shaped stem 20 is rigidly coupled to the piston 19, protrudes above the worktable 2 and supports a strip locking device, generally designated by the reference numeral 21, which is composed of an arm 22 which cantilevers out from the top of the column 20 to which it is fixed and includes guiding means for a pair of sliders 23 and 24.
    Two hydraulic jacks 25 and 26 are fitted on the sliders 23 and 24 and their stems 27 and 28 protrude downward below the arm 22 and support respective pads 29 and 30 at their lower end.
    Respective threaded shafts 31 and 32 are engaged by screwing in the sliders 23 and 24 and can be actuated by a pair of motors 33 and 34 so as to allow the movement of the sliders 23 and 24 along the guides independently of each other.
    According to the method of the invention, once the profile of the cross-section of the strips 3 has been detected, the motors 33 and 34 are actuated so as to place the pads 29 and 30 in the intended positions for locking the strips 3. At the same time, the motor 6 is actuated so as to arrange the stapling head 9 on the points where the staples for joining the strips 3 are to be inserted.
    According to the flowchart of Figure 2, the method starts by reading, step 35, the cross-section of the strips that compose the frame. This can occur by means of a scanner which faces a reference "slice" of the strip used.
    The image obtained by the scanner is processed so as to provide the stapling machine with the necessary operating instructions.
    This processing comprises the digitizing 36 of the image in binary format (black and white).
    By using smoothing methods, the elimination 37 of the background noise from the image and the calculation and graphical visualization 38 on an appropriate display of the contour of the cross-section are performed. Such calculation and visualization can use electronic filters based on differentiation processes (gradient) and linear interpolation functions.
    Depending on the resolution of the image and on the distance of the black and white pixels that define the contour, the calculation 39 of the dimensions of the frame is performed and the type of strip is identified. From the detected dimensions and the type (profile) of the identified strip, identification 40 of the points where the locking pads 29 and 30 are to be placed is performed.
    The position 41 in which the staples must be driven into the strips and their number is determined depending on the type of stapling provided, i.e., on the characteristics of the staples used, on the sectional dimensions of the strips and on the frame to be provided, and on the engagement positions of the locking pads.
    The stapling program thus set is sent to the stapling machine 42, which performs it by initially placing the pads 29 and 30 and actuating them into the position for locking the strips and by then moving the carriage 5 along the guides 4 so that the stapling head 9 is arranged in a staple insertion point. Then, by means of the motor 6, the head 9 is moved at the other positions for inserting the staples.
    Conveniently, after determination 41 of the position of the staples and before transfer of the stapling program to the stapling machine 42, it is possible to perform a verification 43 of the mechanical strength of the stapling according to the type of wood and staples used and a graphical visualization 44 on a display of the set stapling, so that the operator can perform optional variations of the stapling parameters.
    The described method is susceptible of numerous modifications and variations, all of which are within the scope of the same inventive concept. Figure 3 illustrates an embodiment in which, after calculation 39 of the dimensions of the frame and identification of the type of strip used, a search is conducted on a database 45 which contains programs for stapling a strip having the same characteristics as the visualized one. If the search leads to a positive decision 46, the program is loaded 47 and visualized 44.
    On the other hand, if the decision 46 is negative, after identification 40 of the locking points, determination 41 of the stapling points and of the number of staples, verification 43 of mechanical strength is performed, with consequent automatic correction 48 of the stapling parameters or with visualization 44 of the stapling.
    At this point it is possible to perform, or not perform, manual modifications 49 of the parameters of the stapling program.
    In case of a negative decision regarding modifications, the program 51 is saved as new and transferred 52 to the stapling machine.
    Figure 4 illustrates another embodiment in which, if an operator does not wish to make changes 50 to the stapling program before it is saved and sent to the stapling machine, the newness or existence of applied modifications 53 is checked.
    The disclosures in Italian Patent Application No. B099A000601 from which this application claims priority are incorporated herein by reference.
    Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the scope of each element identified by way of example by such reference signs.

    Claims (9)

    1. A method for controlling the assembly cycle of strips for forming frames in assembling machines, characterized in that it comprises the steps of:
      reading, by means of a scanner, the cross-section of one of the strips that compose the frame in order to obtain a resulting image of said cross-section;
      digitizing the resulting image in binary format;
      graphically visualizing said cross-section;
      calculating dimensions of the cross-section;
      identifying points suitable for positioning strip locking means;
      determining points of application of stapling elements and the number of said elements to be applied in each point;
      activating the assembling machine to perform the stapling of the strips.
    2. The method according to claim 1, characterized in that after digitizing the resulting image in binary format, background noise of the image is eliminated by means of electronic smoothing techniques.
    3. The method according to claim 1, characterized in that filters based on differentiation processes and linear interpolation functions are used for calculation and graphic visualization of the cross-section and of dimensions thereof.
    4. The method according to claim 1, characterized in that after determining the points of application of the stapling elements and the number of said elements, verification of the mechanical strength of the stapling is conducted according to the type of wood of the strips and to the type of stapling elements used.
    5. The method according to claim 1, characterized in that after calculating the dimensions of the cross-section, a search is conducted on a database which contains programs for stapling a strip having the same characteristics as the one being visualized.
    6. A machine for controlling the assembly cycle of strips for forming frames in assembling machines, characterized in that it comprises a footing (1) provided with a worktable (2) in which an opening is provided for the passage of a stapling head (9), a guide (4) which is fixed on said footing (1) and is parallel to said worktable (2), a carriage (5) which can slide along said guide and can be arranged on it by way of motor means (6), a stapling head (9) which is supported by said carriage (5) below said worktable (2), a column (20) which is supported on said footing and supports a horizontal guide (22) on which means (25-30) for locking a strip (3) on said worktable can be arranged horizontally.
    7. The machine according to claim 6, characterized in that said column (20) is constituted by the stem of a vertical jack (17).
    8. The machine according to claim 6, characterized in that at least one slider (23, 24) can slide on said horizontal guide (22) supported by said column and in that a vertical fluid-actuated cylinder (25, 26) is fixed on said slider and is provided with a stem (27, 28) which protrudes downward, a locking pad (29, 30) for a strip being rigidly coupled to the lower end of said stem, said stem (27, 28) being arrangeable along said guide by means of a threaded rod (31, 32) which is engaged by screwing on said slider and is actuated by a motor (33, 34) which is fixed on said guide (22).
    9. The machine according to claim 6, characterized in that said stapling head (9) can be positioned by means of a threaded rod (7) which is engaged by screwing in said carriage (5) and can be actuated by means of a motor (6) which is fixed to the footing.
    EP00123439A 1999-11-08 2000-11-03 Method for controlling the assembly cycle of a frame assembling machine and machine for carrying out the method Expired - Lifetime EP1097791B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    ITBO990601 1999-11-08
    IT1999BO000601A IT1311137B1 (en) 1999-11-08 1999-11-08 PROCEDURE FOR CHECKING THE ASSEMBLY CYCLE OF A FRAME AND ASSEMBLY MACHINE FOR IMPLEMENTING SUCH

    Publications (3)

    Publication Number Publication Date
    EP1097791A2 true EP1097791A2 (en) 2001-05-09
    EP1097791A3 EP1097791A3 (en) 2002-01-16
    EP1097791B1 EP1097791B1 (en) 2004-06-02

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00123439A Expired - Lifetime EP1097791B1 (en) 1999-11-08 2000-11-03 Method for controlling the assembly cycle of a frame assembling machine and machine for carrying out the method

    Country Status (6)

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    US (1) US6434439B1 (en)
    EP (1) EP1097791B1 (en)
    AT (1) ATE268251T1 (en)
    DE (1) DE60011209D1 (en)
    ES (1) ES2220319T3 (en)
    IT (1) IT1311137B1 (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1369214A2 (en) 2002-06-04 2003-12-10 Hans Hundegger Apparatus and method for assembling multilayer panels

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US7389152B2 (en) * 2004-06-04 2008-06-17 Scan-Optics Inc. High speed image scanner

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    IT208953Z2 (en) * 1985-03-12 1988-08-29 Raffoni Giuseppe IMPROVEMENTS IN THE PROFILES OF THE STAPLES, ONDINE OR PLATES FOR THE CORNER CONNECTIONS OF AUCTIONS, FRAMES AND FRAMES IN GENERAL
    US5091962A (en) * 1987-08-11 1992-02-25 Oberg Industries, Inc. Method and apparatus for detecting a sheet strip material misfeed condition
    US4876787A (en) * 1988-06-20 1989-10-31 Jeffrey L. Ditty Apparatus and method for frame wall fabrication
    US4830257A (en) * 1988-08-12 1989-05-16 Lin Long Chung Electropneumatic V-staple driving machine
    US4995087A (en) 1989-05-15 1991-02-19 General Electric Company Machine vision system
    DE4027057A1 (en) 1990-08-27 1992-03-05 Andreas Baur METHOD FOR THE PRODUCTION OF A FOOT FITTING
    US5191706A (en) * 1991-07-15 1993-03-09 Delmarva Sash & Door Company Of Maryland, Inc. Machine and method for attaching casing to a structural frame assembly
    IT227938Y1 (en) * 1992-09-25 1998-01-21 Alfamacchine Di Raffoni Giusep LAMELLAR CLAMP TO JOIN PROFILE STRIPS AT AN ANGLE
    US5333979A (en) * 1992-10-29 1994-08-02 Giuseppe Raffoni Laminar joining staple
    US5816467A (en) * 1994-11-28 1998-10-06 Bullseye Fastener Development, Inc. Apparatus for applying fasteners to picture frames
    US6010053A (en) * 1995-09-11 2000-01-04 Maschinenbau Beni Werfeli Device for fitting bar components in a frame
    IT242336Y1 (en) * 1996-03-01 2001-06-14 Raffoni Giuseppe LAMELLAR CLAMP TO JOIN PROFILE STRIPS AT AN ANGLE.
    US5904789A (en) 1997-11-24 1999-05-18 Imaginal Systematics, L.L.C. Box spring stapler apparatus and method
    IT1309268B1 (en) * 1999-05-26 2002-01-16 Giuseppe Raffoni EQUIPMENT FOR THE REALIZATION OF RECTANGULAR FRAMES

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1369214A2 (en) 2002-06-04 2003-12-10 Hans Hundegger Apparatus and method for assembling multilayer panels
    EP1369214A3 (en) * 2002-06-04 2008-11-19 Hans Hundegger Apparatus and method for assembling multilayer panels

    Also Published As

    Publication number Publication date
    ITBO990601A1 (en) 2001-05-08
    EP1097791A3 (en) 2002-01-16
    DE60011209D1 (en) 2004-07-08
    EP1097791B1 (en) 2004-06-02
    ATE268251T1 (en) 2004-06-15
    ITBO990601A0 (en) 1999-11-08
    IT1311137B1 (en) 2002-03-04
    ES2220319T3 (en) 2004-12-16
    US6434439B1 (en) 2002-08-13

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